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Battery information (such as name, manufacturer, serial number) are stored in that board. I'm sure, if you replace your battery cells with LG or Samsung it'll still show Sanyo. So, it's upto the manufactures to display the name. But, for some reason they try show the original manufacturer name.
Yes, there are few companies who made Li ion cells but, there are Chinese companies who also make Li ion cells. It isn't necessary they buy from these manufacturers.My understanding is that, as li ion cells are made by very few companies in the world like Sony, LG, Samsung, panasonic ,toshiba etc so like all companies like Lapgrade has to buy Li cell from them so they bought Li ion cells from Sanyo(aka panasonic) then made the black plastic so that it fits into laptop and circuit and sell these under Lapgade brand.